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Split Cycle: A New Condorcet Consistent Voting Method Independent of Clones and Immune to Spoilers

5 April 2020
Wesley H. Holliday
Eric Pacuit
ArXiv (abs)PDFHTML
Abstract

We introduce a new Condorcet consistent voting method, called Split Cycle. Split Cycle belongs to the small family of known voting methods satisfying independence of clones and the Pareto principle. Unlike other methods in this family, Split Cycle satisfies a new criterion we call immunity to spoilers, which concerns adding candidates to elections, as well as the known criteria of positive involvement and negative involvement, which concern adding voters to elections. Thus, relative to other clone-independent Paretian methods, Split Cycle mitigates "spoiler effects" and "strong no show paradoxes."

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